71 Demon

Looks like you are having a ball. I would be anyway lol.
After you get all of the lead out of those areas where the lead was removed grind the areas with 36-40 grit. I like 2-3 in roloc on a side die grinder. Fill the areas/seams good with milled or short strand fiberglass filler. Block with 36-40 then proceed with your regular 2k poly fillers. Some ppl like to shoot the seams first with epoxy primer then start filling. Your choice. Good luck and have fun!